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Really BPs have a similar issue to fancy goldfish...they are deformed due to their round body shape. Some are worse than others...I had one several years ago which was more elongated than most and it had no issues, but its organs weren't as scrunched into its body cavity either. You may also benefit from feeding them vegetation as it improves digestion, your Severum also requires plant matter in its diet as does the Pleco...so its not like any of it will go to waste. Some deshelled blanched peas, nori, blanched zuchinni, etc are all great. Devote one day per week to feeding vegetation...you will also see color improvement in your fish from doing so.